However, plaintiffs could then simply register the proper version and
re-file.

We're in the good ole *USA*...

Yes, that is the country in which the court said:
<http://scholar.google.com/scholar_case?case=17023397710384183185>
Now that the meaning of the Bankruptcy Stipulation is
authoritatively established, ISPI is on clear notice
that it may not use SimplexGrinnell's proprietary
software beyond the limits set forth in this opinion.
Provided that SimplexGrinnell register its copyrights,
therefore, should ISPI engage in further infringement
of versions not covered by this injunction, injunctive
relief, and possible damages in significant amount, may
follow. There is thus an adequate deterrent to future
abuse by ISPI of copyrighted materials.